How do i access a global vb file within a vb codefile?

Firstly, I am writing code in VB.

I have created a vb file called GlobalFunctions in my App_code directory which has the code:
Imports Microsoft.VisualBasic
Public Class GlobalFunctions
    Inherits System.Web.UI.Page

    Public Sub tester()
        response.write("hello!")
    End Sub
End Class
Now if i have an aspx page with a codefile how can i call the tester function of the globalFunction class within this codefile?
(The idea is that i want to create a global class for functions i use over again)
Thanks :)

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